{"id":"4aae8861-b638-4fa3-b826-a218541f2f2b","shortId":"WAAgPC","kind":"x402","title":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request ACH endpoint on Base via x402 — $0.02/call in USDC, no API keys required.","description":"This endpoint at `/api/v1/ach/152` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data analytics, AI/ML inference, finance, crypto, and utility services. All endpoints use the x402 payment protocol, settling in USDC on the Base network. The specific function of the `/api/v1/ach/152` path is not documented — the listing title is simply \"Premium API Access\" and the endpoint sits under an `/ach/` path prefix that does not appear in the site's publicly listed API catalog.\n\nPricing is $0.02 per request (maxAmountRequired of 20,000 base units of USDC with 6 decimals = $0.02). Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments. The asset used is USDC at contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913` on Base. The endpoint accepts HTTP POST and returns `application/json`.\n\nBecause the `/api/v1/ach/152` path is not listed among the site's documented APIs and no further documentation, request schema, or response schema is available, the actual functionality behind this endpoint is unclear. The broader platform advertises categories like metrics, reports, sentiment analysis, text summarization, price feeds, geocoding, and more — all at the same $0.02 price point — but none map to this specific ACH route. Prospective callers should be aware that the endpoint is live (returns a valid 402 challenge) but its behavior is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["finance","infrastructure"],"synonyms":["ACH API","payment API","lowpaymentfee","x402 endpoint","USDC micropayment","Base network API","pay-per-call API"],"warnings":["The /api/v1/ach/152 path does not appear in the site's public API catalog — its actual functionality is unknown.","No request or response schema is documented; callers must discover behavior experimentally.","Documentation pages (/docs, /api, /pricing, /README) all returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/ach/152","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/ach/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but the specific /api/v1/ach/152 path is not documented anywhere on the site. No request schema, response schema, or functional description is available. The listing is effectively a stub with only pricing and protocol details 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'/api/v1/ach/152':40,86,176 '/call':12,30 '0.02':11,29,122,136,227 '000':128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':163 '20':127 '402':251 '6':134 'ACH API' 'Base network API' 'USDC micropayment' 'accept':168 'access':98 'ach':5,23,236 'actual':199 'advertis':209 'ai/ml':60 'among':181 'analysi':215 'analyt':59 'api':16,34,56,97,118,147,186 'appear':111 'application/json':173 'asset':157 'avail':197 'awar':242 'base':8,26,79,129,165 'behavior':255 'behind':201 'broader':207 'caller':239 'catalog':119 'categori':210 'challeng':252 'collect':50 'commit':155 'contract':162 'crypto':63 'data':58 'decim':135 'document':90,185,190 'endpoint':6,24,38,68,101,167,203,245 'exact':143 'feed':219 'financ':62 'function':83,200 'geocod':220 'http':169 'http-post' 'infer':61 'json-response' 'key':17,35,148 'like':211 'limit':151 'list':92,117,180 'live':247 'lowpaymentfee' 'lowpaymentfee.com':45 'made':139 'map':232 'maxamountrequir':125 'metric':212 'network':80 'none':231 'offer':48 'part':42 'path':87,106,177 'pay':2,20,53 'pay-per-call API' 'pay-per-request':1,19,52 'payment':72,137 'payment API' 'per':3,21,54,123 'platform':46,208 'point':229 'post':170 'prefix':107 'premium':96 'price':120,218,228 'prospect':238 'protocol':73 'public':116 'rate':150 'report':213 'request':4,22,55,124,191 'requir':18,36 'respons':194 'return':172,248 'rout':237 'schema':192,195 'scheme':144 'sentiment':214 'servic':66 'settl':74 'simpli':95 'sit':102 'site':114,183 'span':57 'specif':82,235 'summar':217 'text':216 'titl':93 'unclear':205 'undocu':257 'unit':130 'upfront':154 'usdc':14,32,76,132,160 'usdc-base' 'use':69,158 'util':65 'valid':250 'via':9,27,140 'x402':10,28,71,142 'x402 endpoint' 'x402-payment'","prices":[{"id":"c3452c97-9d01-435a-84c6-8337d75a89ae","listingId":"4aae8861-b638-4fa3-b826-a218541f2f2b","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/ach/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:42:02.727Z"}],"sources":[{"listingId":"4aae8861-b638-4fa3-b826-a218541f2f2b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/ach/152","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:42:02.727Z","lastSeenAt":"2026-04-27T14:04:43.052Z"}],"details":{"listingId":"4aae8861-b638-4fa3-b826-a218541f2f2b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/ach/152 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/ach/152"},{"claim":"The endpoint returns a valid x402 version 1 challenge with scheme 'exact' and accepts POST.","source_url":"https://lowpaymentfee.com/api/v1/ach/152"}],"useCases":["Programmatic access to an ACH-related service with per-request USDC micropayments","Agent-driven API consumption without API key management","Integrating pay-as-you-go endpoints into automated workflows"],"bestFor":["Developers wanting keyless, pay-per-request API access on Base","AI agents that can settle x402 payments in USDC","Users who prefer no subscriptions or rate limits"],"notFor":["Anyone needing documented request/response schemas before integration","Use cases requiring free or fiat-only payment methods","High-volume batch processing where per-call fees add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:31.414Z"},"updatedAt":"2026-04-27T14:04:43.052Z"}}